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From: robbar@aplcen.apl.jhu.edu (Baruch robert)
Newsgroups: comp.sys.ibm.pc
Subject: Re: I/O and Intel 8259A
Summary: handling a hardware interrupt.
Message-ID: <1991Apr7.003952.12179@aplcen.apl.jhu.edu>
Date: 7 Apr 91 00:39:52 GMT
References: <16412@chaph.usc.edu>
Reply-To: robbar@aplcen (Robert Baruch )
Organization: Johns Hopkins University
Lines: 12

In article <16412@chaph.usc.edu> syau@aludra.usc.edu (Shu-Jye Syau) writes:
>Hi :
>    I install a voice card in PC , when voice input , the ADC will interrupt
>8259A , and execute a interrupt handler to read in digital data from ADC .
>(hardware interrupt).
>
What IRQ line will the device interrupt on?  Is this interrupt enabled?
Has an ISR (interrupt service routine) been loaded in memory at the 
address specified in the Interrupt Vector Table?

These are all important questions that must be answered to get a
device to respond to an interrupt.